Abs lead acid battery jar cover heat sealing process

Abstract

The present application relates to a kind of ABS lead-acid battery tank cover heat sealing process, comprising the following process steps: step one, preparation is prepared from ABS material and shell cover;Shell is provided with battery tank, and first groove is provided on the tank wall of battery tank;Cover surface is outwardly convex and forms connecting rib, and second groove is provided on connecting rib;Step two, connecting rib is heat melted and handled, comprising the following substeps: a, the outer surface of connecting rib is heat melted and forms first molten layer;B, preheat negative thermal expansion material to same temperature with connecting rib heat melting in step a, when the outer surface of connecting rib heat melting is completed, the negative thermal expansion material is filled into second groove;Step three, the connecting rib of cover is aligned with the first groove of tank wall and is pressed and docked, with the negative thermal expansion material in second groove gradually cooling, so that connecting rib expands and first molten layer is pressed in the inner wall of first groove, so that the connection of cover and battery tank is firm.

Description

Technical Field

[0001] This invention relates to the field of lead-acid battery manufacturing technology, and in particular to a heat-sealing process for ABS lead-acid battery case covers. Background Technology

[0002] Lead-acid batteries are a common type of power supply. Their structure includes a casing and a cover. The casing has a battery slot for holding the electrolyte, and the cover fits over the slot opening to seal and prevent electrolyte leakage. Currently, most lead-acid battery casings and covers are made of ABS material. ABS material is characterized by high mechanical strength, strong impact resistance, good acid and alkali chemical stability, and can withstand ambient temperatures from -40℃ to 80℃. The cover is often heat-fused to the battery slot in the casing. The specific procedure is as follows: first, the surface of the area where the cover and the battery slot will meet is heated until melted; then, the cover is directly snapped onto the opening of the battery slot; after cooling, the cover is firmly bonded to the opening of the battery slot.

[0003] However, this type of heat-fusion connection has a problem: the interface between the heat-fused part of the battery cover and the battery case is not completely fused together. After cooling and shrinkage, gaps will form at the interface, resulting in an insufficiently strong connection between the battery case and the cover. This can easily lead to cracking during subsequent use, causing electrolyte leakage. Summary of the Invention

[0004] Therefore, in order to address the above-mentioned problems, this invention proposes a heat-sealing process for ABS lead-acid battery case covers, which solves the problem that during the process of heat-melting the case cover to the battery case in the casing, gaps are formed at the interface between the heat-melted part of the case cover and the battery case after cooling and shrinkage, resulting in an unstable connection between the case cover and the battery case.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A heat-sealing process for ABS lead-acid battery case covers includes the following steps:

[0007] Step 1: Prepare the tank cover and shell made of ABS material;

[0008] The housing has a battery slot, and the upper edge of the battery slot wall has a first groove.

[0009] The surface of the groove cover protrudes outward to form a connecting rib that matches the first groove, and a second groove is formed on the connecting rib.

[0010] Step 2: Perform heat melting treatment on the connecting ribs, including the following sub-steps:

[0011] a. The outer surface of the connecting rib, excluding the inner wall of the second groove, is thermally melted to form a first molten layer;

[0012] b. Preheat the negative thermal expansion material to the same temperature as the thermal melting of the connecting rib described in step a. When the outer surface of the connecting rib has been thermally melted, fill the negative thermal expansion material into the second groove.

[0013] Step 3: Align the connecting ribs of the groove cover with the first groove along the upper edge of the groove wall and press them together, then allow them to cool naturally so that the first molten layer on the outer surface of the connecting ribs adheres to the inner wall of the first groove.

[0014] As the negative thermal expansion material in the second groove gradually cools, the expansion of the negative thermal expansion material causes the second groove to open to both sides, which in turn causes the connecting rib to expand and press the first molten layer against the inner wall of the first groove. The first molten layer will not separate from the inner wall of the first groove due to cooling and shrinkage.

[0015] Furthermore, sub-step a further includes thermally melting the inner wall of the first trench to form a second molten layer;

[0016] In step three, the first molten layer on the outer surface of the connecting rib is bonded to the second molten layer on the inner wall of the first groove.

[0017] Furthermore, the thermal melting temperature of the first molten layer and the second molten layer is 260℃-310℃, the thermal melting time is controlled between 8s and 20s, the depth of the first molten layer is 1mm-1.8mm, and the depth of the second molten layer is 1mm-1.8mm.

[0018] The formation of the first molten layer and the second molten layer is synchronized.

[0019] Furthermore, the ABS material comprises 20-30 parts by weight of acrylonitrile, 6-30 parts by weight of butadiene, and 45-70 parts by weight of styrene.

[0020] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0021] This heat-sealing process for ABS lead-acid battery case covers involves creating a first groove along the wall of the battery case, and a connecting rib protruding outwards on the surface of the case cover to match the first groove. A second groove is also created on the connecting rib. When the battery case and case cover are joined, the outer surface of the connecting rib is first melted to form a first molten layer. A negative thermal expansion material is added to the second groove, causing the inner wall of the first groove to melt and form a second molten layer. Then, the connecting rib of the case cover is aligned with the first groove along the wall and pressurized to bond the first molten layer on the outer surface of the connecting rib to the second molten layer on the inner wall of the first groove. As the negative thermal expansion material in the second groove gradually cools, its expansion causes the second groove to open to both sides. This, in turn, causes the connecting rib to expand, keeping the first molten layer and the second molten layer on the inner wall of the first groove pressed together. The first molten layer will not separate from the second molten layer on the inner wall of the first groove due to cooling and contraction; that is, no gap will form after the first and second molten layers cool, ensuring a strong connection between the case cover and the battery case. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a lead-acid battery.

[0023] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0024] Figure 3 This is a cross-sectional view of the first groove along the upper edge of the trench wall.

[0025] Figure 4 This is a schematic diagram of the groove cover structure.

[0026] Figure 5 yes Figure 4 Enlarged view of section B in the middle.

[0027] Figure 6 This is a cross-sectional view of the second groove on the connecting bar.

[0028] Figure 7 This is a partial cross-sectional view of the battery compartment cover being attached to the battery compartment. Detailed Implementation

[0029] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0030] refer to Figures 1-7 This embodiment provides a heat-sealing process for ABS lead-acid battery case covers, including the following process steps:

[0031] Step 1: Prepare the shell 1 and the groove cover 2 made of ABS material. In this specific embodiment, preferably, the ABS material contains 20-30 parts by weight of acrylonitrile, 6-30 parts by weight of butadiene, and 45-70 parts by weight of styrene. Experiments have shown that ABS material with the above composition is more suitable for heat fusion.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, the housing 1 has a battery compartment 10 for holding electrolyte. A first groove 12 (e.g., ...) is formed along the upper edge 11 of the wall of the battery compartment 10 (the wall is not marked in the figure, but those skilled in the art should understand its location). Figure 2 (As shown).

[0033] like Figure 4 , Figure 5 and Figure 6 As shown, the surface of the groove cover 2 protrudes outward to form a connecting rib 21 that is adapted to the first groove 12, and a second groove 22 is provided on the connecting rib 21.

[0034] Step 2: Perform heat melting treatment on the inner wall of the first groove 12 and the outer surface of the connecting rib 21, including the following sub-steps:

[0035] a. The outer surface of the connecting rib 21, excluding the inner wall of the second groove 22, is thermally melted to form a first molten layer 200; the inner wall of the first groove 12 is thermally melted to form a second molten layer 100.

[0036] The melting temperature of the first molten layer 200 and the second molten layer 100 is 260℃-310℃, and the melting time is controlled between 8s and 20s. The depth of the first molten layer 200 is 1mm-1.8mm, and the depth of the second molten layer 100 is 1mm-1.8mm.

[0037] The thermal melting temperatures of the first molten layer 200 and the second molten layer 100 need to be determined by selecting a more practical negative thermal expansion material 3.

[0038] Furthermore, the formation of the first molten layer 200 and the second molten layer 100 is synchronized.

[0039] b. Heat the negative thermal expansion material 3 to the same temperature as the thermal melting of the connecting rib 21 described in step a. When the outer surface of the connecting rib 21 has been thermally melted, fill the negative thermal expansion material 3 into the second groove 22.

[0040] In this specific embodiment, the negative thermal expansion material 3 is made of metallic bismuth, which has a melting point of 271.5°C. When metallic bismuth melts, it is in a liquid state, and when it is cooled into a solid state, its volume (compared to the liquid state) increases by about 3.3%.

[0041] If the negative thermal expansion material 3 is metallic bismuth, then in step two above, the preferred melting temperatures of the first molten layer 200 and the second molten layer 100 are above 271.5°C and below 310°C. However, it should be noted that the melting temperatures of the first molten layer 200 and the second molten layer 100 must be consistent with the preheating temperature of the metallic bismuth.

[0042] Step 3: Align the connecting rib 21 of the groove cover 2 with the first groove 12 on the upper edge of the groove wall and pressurize to connect them. Then allow it to cool naturally so that the first molten layer 200 on the outer surface of the connecting rib 21 is bonded to the second molten layer 100 on the inner wall of the first groove 12.

[0043] As the negative thermal expansion material 3 within the second groove 22 gradually cools, its expansion causes the second groove 22 to open to both sides. This, in turn, causes the connecting rib 21 to expand, maintaining the first molten layer 200 in a pressed state with the second molten layer 100 on the inner wall of the first groove until cooling is complete. Through these process steps, the first molten layer 200 will not separate from the second molten layer 100 on the inner wall of the first groove due to cooling and shrinkage; that is, no gap will form between the first molten layer 200 and the second molten layer 100 after cooling. Compared to existing technologies, the connection between the groove cover 2 and the shell 1 is more robust, representing a significant improvement.

[0044] The aforementioned negative thermal expansion material 3 can also be metallic gallium.

[0045] This heat-sealing process for ABS lead-acid battery case covers solves the problem that during the process of heat-melting the case cover into the battery case of the casing, gaps are formed at the interface between the heat-melted part of the case cover and the battery case after cooling and shrinkage, resulting in an unstable connection between the case cover and the battery case.

[0046] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A heat-sealing process for ABS lead-acid battery case covers, characterized in that, The process includes the following steps: Step 1: Prepare the tank cover and shell made of ABS material; The housing has a battery slot, and the upper edge of the battery slot wall has a first groove. The surface of the groove cover protrudes outward to form a connecting rib that is adapted to the first groove, and a second groove is formed on the connecting rib. Step 2: Perform heat melting treatment on the connecting ribs, including the following sub-steps: a. The outer surface of the connecting rib, excluding the inner wall of the second groove, is thermally melted to form a first molten layer; b. Preheat the negative thermal expansion material to the same temperature as the thermal melting of the connecting rib described in step a. When the outer surface of the connecting rib has been thermally melted, fill the negative thermal expansion material into the second groove. Step 3: Align the connecting ribs of the groove cover with the first groove along the upper edge of the groove wall and press them together, then allow them to cool naturally so that the first molten layer on the outer surface of the connecting ribs adheres to the inner wall of the first groove. As the negative thermal expansion material in the second groove gradually cools, the expansion of the negative thermal expansion material causes the second groove to open to both sides, which in turn causes the connecting rib to expand and press the first molten layer against the inner wall of the first groove. The first molten layer will not separate from the inner wall of the first groove due to cooling and shrinkage.

2. The heat-sealing process for an ABS lead-acid battery case cover according to claim 1, characterized in that: Sub-step a further includes thermally melting the inner wall of the first trench to form a second molten layer; In step three, the first molten layer on the outer surface of the connecting rib is bonded to the second molten layer on the inner wall of the first groove.

3. The heat-sealing process for an ABS lead-acid battery case cover according to claim 2, characterized in that: The melting temperature of the first molten layer and the second molten layer is 260℃-310℃, the melting time is controlled between 8s and 20s, the depth of the first molten layer is 1mm-1.8mm, and the depth of the second molten layer is 1mm-1.8mm. The formation of the first molten layer and the second molten layer is synchronized.

4. The heat-sealing process for an ABS lead-acid battery case cover according to claim 3, characterized in that: The ABS material comprises 20-30 parts by weight of acrylonitrile, 6-30 parts by weight of butadiene, and 45-70 parts by weight of styrene.

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